The CTA Tools Cummins 2-pc Turbo Wrench Set, No. 7005, has a 1/2" square drive and fits both 15mm and 12mm turbocharger bolts on Cummins ISB 5.9L and 6.7L turbo diesel engines. The set is ideal for cleaning and servicing turbochargers used with turbo drilling and cleaning kits. It services RAM/Cummins trucks with 1998.5-2007 ISB 5.9L and 2007-2014 6.7L diesel engines.